Car roof



lil

Patented rapr. l, 1924i.

CHARLES @AVID BNSALB, OIE PITTSBURGH, PENN'ZL'VANIA, ASSEGNO-R T0 P. H. llURPHY COlllAhl'-Z, GTS NEVI KENSENGTGN, PENNSYLVAMA, A CGBPORLATIO'N 0F PENNSYLVN lld.

CAR ROOF.

application filed July 26, 1922. Serial Iso. 577,558.

To aZZ whom t may concer/n.:

Be it known that l, CHARLES. DAVID BON- sALr., a citizen of the United States, and a resident ci the city of Pittsburgh, county of Allegheny, and State of Pennsylvania, have invented a certain new and useful linprovenient in Car Roots, of which the following is a speciiication.

lhis invention relates principally to car roofs oi' the all-steel riveted-up type wherein the roofing sheets extend from eaves to eaves of the car and are rigidly secured thereto and have overlapped side marginal portions that are shaped and are rigidly scoured to form weather prooiing seams or joints that serve as carlines. @ne oit the principal objects oi.3 the present invention is to increase the strength and rigidity of the roei ioy im proving the shape and arrangement of the overlapped side marginal portions et the sheets. @ther objects are to reduce the weight of the root, to simplify the construction thereof and to cheapen the costof manun facture. The invention consists principally in shaping and arranging the cooperating marginal portions of the roof sheets to form hollow weather proofing seams'for joints that are better fitted for taking care of contemplated stresses. rlhe invention also consists in the parts and in the arrangements and combinations or" parts hereinafter described and claimed ln the accompanying drawing, wherein like symbols refer to like parts wherever they occur,

Fig. l is a plan view ci" a portion of the car root embodying my invention;

F ig. 2 is a transverse section through onehalf of the roof, the section being taken' hetween seams on the line 2- 2 in Fig. l;

Fig. 3 is a vertical cross-section through one ot the seams or joints at the ridge on the line 8-3 in Fig. l;

Fig. d is a similar section adjacent to the side plate on the line Ll--l in F ig. l;

Fles. 5 and 6 are vertical cross-sections embodying a inodilied form of seam or joint construction, the sections being taken at points corresponding to the llines of section 8-3 and fl-1, respectively, in Fig. l; and

Figs. i and 8 are like views illustrating still another modied form of seam or joint construction.

The roof shown in Figs. l to 4i, inclusive, of the accompanying drawing comprises metallic roof sheets 10 that extend trans versely of the oar from eaves to veaves thereof with their side margins overlapped. The roof sheets slope upwardly from the eaves towards the ridge and are supportedattheir eaves ends on metal side plates l-l. The roof sheets are rigidly secured to the side lates ll by rivets l2 and are provided with ownturned eaves flanges v13 which overhang the outer edges of the side plates.

One side margin of each sheet is pressed up to form a hollow strengthening rib A, and the other side margin is pressed up to form a hollow strengthening rib B, both ribs extending from end to end of the sheet. rllhe root sheets are assembled on the car by placing the type A rib of one sheet over the type B rib of the next adjacent sheet, whereby the lapped ribs cooperate to form hollow upstanding seams or joints that extend from side plate to side plate and serve as carlines. The overlapped portions ot' the sheets are suitably secured together on each side of the lapped ribs A and B by a row of rivets let. .'lllius, the overlapped portions of adjacent roof sheets are rigidly `secured together from side plate to side plate by two rows of rivets, the rowv oit rivets on one side of a seam or joint extending through the overlapping side marginal ange 15 of one sheet and the underlying body portion of the other sheet, and the row of rivets on the opposite side of said seam or joint extending through the overlapping body portion of said lirst mentioned sheet and the underlying side marginal flange 16 of said second mentioned sheet.

The ribs of both types are preferably of inverted channel-shaped section and have a maximum depth at the ridge and gradually decrease in depth towards the eaves where they are curved downwardly and merge into the plane of the sheets at the eaves ends thereof. The type A ribshave a minimum width at theridge, at which point they closely embrace the type B ribs, and widen gradually to the eaves; and the type B ribs have a maximum width at the ridge and gradually decrease in width to the eaves. This widening or tapering of the cooperatingfribs of the types A and B in opposite directions on each side of theridge produces a seam construction comprising a pair of overlapped channels whoseside walls are in contact at the ridge and diverge from each other on opposite sides thereof to orrn a seain or joint whose cross-sectional shape gradually changes Jfrom an inverted channel of double thickness at the ridge to a double boX-girder at the eaves.

rlhe sheets are preferably pressed from blank sheets or uniform width, whereby the gradual decrease in depth or theV ribs A from the ridge towards the caves affords a surplus oli' metal which is utilised in securing a uniform widening oi' said ribs from the ridge to the eaves; and the gradually decreased depth and width of the ribs B iroin the ridge towards the eaves affords a plus of metal which is utilized in gradually increasing the width of the adjacent side marginal liange i6 orp the sheet the ridge towards the eaves. r)The side marginal ange 15 that is located outside of the type A rib oi each sheet is oi substantially uniiorm width except tor its eaves end portions, which portions together with the corresponding eaves end portions of the side marginal 1Stange i6 located adjacent the type B rib, widen gradually to the eaves by reason of the surplus oi instal afforded by the down-turned eaves end portions of said ribs.

Running boards 17 extend longitudinally of the carat the ridge and bolted. or otherwise rigidly secured to the upwardly oilset flanges of running boards saddles i8, which rest on and are riveted to the tops i seams or joints. 1

lt is noted that the sea'ni or joint produced by the cooperating ribs or" the types A and B accomplish the various functions orp the carline. The cross-sectional shape of the seams or joints at the ridge serves t increase the vertical carrying capacity of the roof, and the cross-sectional shape of thesearns at the eaves serves to taire care ot the stresses that tend to raolr and twist the car body and distort it endwise. This in creased strength in the seains or joints enables a roof to be 'produced that will be stitfer and stronger than previous roots ci the saine weight of metal. Y

In the niodiiied seams or joints construction shown in Figs. 5 and 6, the overlapping marginal portion oi: one sheet is provided with an upstanding hollow rib Eil of grail ually decreasing depth and gradually increasing width L'irorn the ridge to the eaves; and the underlying marginal portion olf the next adjacent sheet is `lornied with an up-I standing rib or flange B1 oi inverted l.,- shaped section. rlhe tops of the lapped ribs A? ad B1 are riveted together; and overlapping marginal liange o one sheet is riveted to the underlying body portion of the other sheet. The outer side wall of the rib A1 oi one sheet is in Contact at the ridge with the opstanding web or the iL-shaped flange B1 of the other sheet and diverges Laeaeoe therefrom on opposite sides of the ridge, thus orining within the hollow seam a hollow boX-girder that gradually increases width troni the ridge to the eaves.

ln thernodiiied seam or joint construction shown w1lgs. i" and 8, the overlapping side niarginal portion ci one sheet is provided with a hollow rib A2 or gradually "th troni ridge to e gli al portion or led with a rib or sea Wiflr alla .1

sheet is riveted to the under ying body portion of the other sheet. rphis arrangement produces a hollow seam having a b`J-x` `termed therein that g adually increases in width and depth'liroin the eaves to the ridge.

@ther modifications ci the form and rangement of the parts may he niade in View of the foregoing description or the invention, and l do not wish to be restricted to the enact nis and arrangements shown in the drawing.

lf-Jhat l claiin is:

l. A car roof comprising a plurality oi instal roof sheets connected along their side margins by raised seains, the seani portion of the upper sheet being of inverted channel shape, and the lower sheet having an L shaped ila-nge at its side inargin under and secured to the upper sheet, and the marginal portion of the upper sheet being secured to the body oit the lower sheet, the vertical portion oil said llc-shaped i'iange being spaced horizontally :troni the vertical portions oi the overlapping sheet.

2. A car rootl comprising a plurality or metal sheets connected along their side inargins by raised searns7 the sea-in portion of the upper sheet being of inverted channel shape and the lower sheet having an tri-shaped marginal portion which is covered by the seam portion of said upper sheet, the top oi" said L-shaped portion being rigidly secured to the top oiY said inverted channel, and the outer margin oi the upper sheet being secured to the body ot the lower sheet, the vertical part of said L-shaped portion diverging horizontally troni the outer wall of said channel rneinber.

3. fr car roof comprising a plurality of metal roei2 sheets extending troni eaves to eaves and having hollow ribs formed in their marginal portions and arranged to overlap each other and be secured together to forni hollow seams, the side Walls oi the lll.)

overlapping ribs diverging from each other between ridge and eaves to form hollow hexgirders within said hollow seams.

d. A. car roer" comprising a plurality o inetal roof sheets extending from eaves to eaves and having hollow ribs formed in their marginal portions and arranged to overlap each other and secured together to orin hollow seams, one of the overlapping ribs of each of said seains being oi' varying width between the ridge and the eaves, and diverging horizontally from the other rib et said scam thereby forming hollow bongirders within YSaid hollow seains.

5. A car roof comprising a plurality o inetal roof sheets extending freni eaves to eaves and having hollow rihs orined in their adjacent side marginal portions that are lapped and rigidly secured together to forni hollow seains, the side walls of the ribs of a seain diverging from each other on opposite sides of the ridge to fori/n hollow boxgirder portions within said seams.

G. A. car rooi2 comprising a plurality of inetal roof sheets extending from eaves to eaves and having hollow ribs ',tornied in their side marginal portions that are lapped and secured together to forni hollow seams, one rib of a seain being of varying width from ridge to eaves, and diverging horizontally frein the other rib of said eeani whereby said seam has a hollow boX-girder portion formed therein whose width varies from ridge to eaves.

7. A oar roof comprising a plurality of metal roof sheets extending from eaves to eaves and having hollow ribs formed in the overlapping their side marginal portions that are lapped and rsecured together to form hollow seams,

the overlapping rib or a seam 1being wider at the eaves than at the ridge, and diverging horizontally from the lower rib of said seam whereby said seam has a holler.7 box girder portion formed therein of greater width at the eaves than at thefridge.

8. A ear roof comprising a plurality of inetal root sheets extending from eaves to eaves and having hollow ribs formed in their side marginal portions that are lapped and secured together to forni hollow seams, rib ci a seam being wider at the eaves than at the ridge, and the underlying rih being of Greater width at the ridge than at Athe eaves.

9. le an article of manufacture, a car roof sheet having a portion adjacent to each side margin 'formed inte a hollow strengthening rib, the rih at one side margin being wider at each end of the sheet than at the middle thereof and the rib at the other side margin of the sheet being wider at the naiddle ci the sheet than at each end thereof.

l0. As an article of manufacture, a car root` sheet having a portion adjacent to each side margin formed into a hollow strengthening rib, the rib at one side margin increasing in width from the middle of the sheet towards each end thereof and the rib at thel other side margin increasing in width from each end of the sheet towards the naiddle thereof.

Signed at New Kensington, Pa., this 22 day of July, 1922.

CHARLES .DAVllD BONSALL 

